鄭濤提出的問題

圖：?如圖 1 所示，在灰色大正方形內(nèi)有 1 個青色正方形和 4 個紅色正方形。

命題：假設(shè)大正方形的面積是50，青色正方形的面積是29。求一個紅色正方形的面積。

Problem created by Tao Steven Zheng

Diagram: There is a large grey square. Inside the large grey square there is one blue square and four red squares as shown in Figure 1.

Problem: Suppose the area of the large square is 50 and the area of the blue square is 29. Determine the area of the red square.